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Multi-family Loans, at Fair Value - Geographic Concentration Risk (Details) - Preferred Equity and Mezzanine Loan Investments - Geographic Concentration Risk	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Texas
Concentration Risk [Line Items]
Geographic concentration, percent	35.00%	30.10%
Tennessee
Concentration Risk [Line Items]
Geographic concentration, percent	14.60%	15.60%
Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.20%	10.90%
Ohio
Concentration Risk [Line Items]
Geographic concentration, percent	8.90%	9.70%
Louisiana
Concentration Risk [Line Items]
Geographic concentration, percent	7.00%	7.50%
Alabama
Concentration Risk [Line Items]
Geographic concentration, percent	6.70%	7.10%
North Carolina
Concentration Risk [Line Items]
Geographic concentration, percent	5.70%	6.10%
Indiana
Concentration Risk [Line Items]
Geographic concentration, percent	5.30%	5.70%

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